MCP48FVB08 datasheet(65/112 Pages) MICROCHIP

65 / 112 page

 2020 Microchip Technology Inc.

DS20006362A-page 65

MCP48FXBX4/8

5.0

DAC CIRCUITRY

The Digital-to-Analog Converter circuitry converts a

digital value into its analog representation. The

description shows the functional operation of the device.

The DAC circuit uses a resistor ladder implementation.

Devices have up to eight DACs.

Figure 5-1 shows the functional block diagram for the

MCP48FXBX4/8 DAC circuitry.

The functional blocks of the DAC include:

• Resistor Ladder

• Voltage Reference Selection

• Output Buffer/VOUT Operation

• Internal Band Gap

• Latch Pins (LATn)

• Power-Down Operation

FIGURE 5-1:

MCP48FXBX4/8 DAC Module Block Diagram.

RS(2)

VREF

DAC

Output

RS(1)

RS(2n – 1)

RS(2n – 2)

RS(2n – 3)

RS(2n)

VDD

VRL

Gain

(1x or 2x)

VOUT

PDnB:PDnA

VDD

PDnB:PDnA

VDD

Band Gap

(1.22V typical)

VRnB:VRnA and

PDnB:PDnA

Selection

Internal Band Gap

Voltage

Reference

Selection

Resistor Ladder

Output Buffer/VOUT

Operation

Power-Down

Operation

Power-Down

Operation

Power-Down

Operation

A (RL)

VRnB:VRnA

Where:

# Resistors in Resistor Ladder =

256 (MCP48FXB0X)

1024 (MCP48FXB1X)

4096 (MCP48FXB2X)

DAC Register Value

# Resistor in Resistor Ladder

----------------------------------------------------------------------VRL



VDD

(~120 k

)

PDnB:PDnA and

VRnB:VRnA

PDnB:PDnA

MCP48FVB08 数据表(PDF) 65 Page - Microchip Technology

MCP48FVB08 数据表(HTML) 65 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载

链接网址

MCP48FVB08 数据表(PDF) 65 Page - Microchip Technology

MCP48FVB08 数据表(HTML) 65 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表 下载

链接网址

数据表下载